Challenge: Write the shortest-possible new-player-tutorial.

1. Do as you are told.
2. Merge squads.
3. Stay with the group.
4. Go to the waypoint.
5. Respawning at transports and capture-points is faster than running across half the map.
6. Ask for help in chat. (Pressing "z")

"Hit them fast and hard, dont give them time to set up, merge squads"
-HTL Offense, pre-match advice.

There is a neccessity to direct players, new and old, within 30 seconds, whether they want it or not, preferably in a single chat-message.
I dont always include all information, and I sometimes use less tactical, more lightweight variants, depending on my mood, like:
-I'll be moving fast, try to keep up my pace.
-Party on C, get your elites to join.

Edit: in an extreme case I just ask for the squad-lead and make sure my squad understands that I expect them to follow orders on the spot.